The file (mtinst.exe) that is available for download at Microsoft’s Online Crash Analysis site (http://oca.microsoft.com/en/windiag.asp) can be used to create a start-up (floppy) disk or an ISO image file (windiag.iso) on your hard disk. Once you have a bootable CD/floppy ready, boot the machine using it. This will load the Windows Memory Diagnostic with a DOS-like user interface. The first test pass begins; you may choose to pause it or just exit the memory test. If the first pass completes without any errors then it is unlikely that second pass will find any, as the consequent tests will use the same test settings.
Press [T] for a detailed inspection of the memory module. This process consumes a lot of time, and you may have to leave your machine on through the night. If you have more than one RAM chip, then use one chip at a time while testing. This way, you’ll know which one is faulty. Moreover, the problem could also arise due to a corroded interface on the motherboard. To counter this problem, perform the test using different combinations of slots and memory. Depending on the type of error and its gravity, you might need to call a technician to rectify the problem—which is most likely replacing the RAM chips or soldering new RAM slots to the motherboard.